JPH0832800B2 - Grip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is suitable for grips for golf clubs, tennis, badminton, squash, rackets such as racquet balls, and grips for sports equipment such as ski poles. And a grip excellent in wear resistance and weather resistance.

[Prior Art] Golf clubs, tennis, badminton, squash,
There are rubber grips for rackets such as racket balls and ski poles. As the rubber grip, those manufactured by molding and vulcanizing a rubber composition mainly containing a diene rubber such as natural rubber have been conventionally used.

[Problems to be Solved by the Invention] Such a rubber grip is required to have characteristics such as non-slip, good touch, and good durability. Both have advantages and disadvantages, and there is room for improvement. For example, rubber conventionally used for grips for golf clubs has a dynamic friction coefficient of 1.0 or less, is slippery when swinging, and lacks a so-called moist feel. On the other hand, there are grips that are somewhat slippery and have a moist feel, but in this case, the dynamic friction coefficient decreases with time after manufacturing, or cracks occur after a certain period of time has passed after the grip was attached to the club. There was a problem such as doing.

[Means and Actions for Solving Problems] The present invention solves the above-mentioned conventional problems, has a high dynamic friction coefficient, is hard to slip, has a moist feeling, and has high wear resistance and weather resistance. To provide a grip from a rubber having 45 to 90 parts by weight of a diene rubber, 5 to 30 parts by weight of an ethylene-propylene binary copolymer and / or an ethylene-propylene-diene terpolymer, and Chlorobutyl rubber 5
A grip characterized by being formed and vulcanized from a rubber compound containing up to 25 parts by weight.

In the present invention, the diene rubber contains a specific amount of ethylene-
A propylene binary copolymer (hereinafter abbreviated as "EPR") and / or an ethylene-propylene-diene ternary copolymer (hereinafter abbreviated as "EPDM") and a specific amount of chlorobutyl rubber are blended. As a result, the dynamic friction coefficient of the obtained rubber is improved, and it has a moist feeling, and further, abrasion resistance, weather resistance and the like are significantly improved, and by shortening the vulcanization time, Productivity can also be increased.

That is, the present inventors have earnestly studied to obtain a rubber compound having good properties as a grip, and as a result, a so-called diene rubber used for a commercially available grip, EPR, or EPR A grip made of a rubber component containing EPDM added with a third diene-based component such as ethylidene norbornene or dicyclopentadiene does not have a sufficient dynamic friction coefficient and feels poor.

A grip containing only a diene rubber as a rubber component has a problem in weather resistance under severe conditions.

For a grip consisting of a rubber component in which a diene rubber is mixed with a butyl rubber for the purpose of improving weather resistance, if a butyl rubber that satisfies only the weather resistance is blended, it will be the same as when butyl rubber alone is used as the rubber component. In addition, the wear resistance and low temperature property (the property that the characteristics at the time of warming is maintained even at the time of cold) are deteriorated, and moreover, the tackiness (stickiness) occurs.

Among butyl rubber, chlorobutyl rubber is especially
Excellent vulcanization characteristics.

I found that.

The present inventors have conducted further studies based on the above findings, and as a result, 45 to 90 parts by weight of diene rubber, EPR and / or EPD.
It was found that a rubber compound containing 5 to 30 parts by weight of M and 5 to 25 parts by weight of chlorobutyl rubber has extremely excellent properties,
The present invention has been completed.

 The present invention will be described in detail below.

In the present invention, examples of the diene rubber include natural rubber (NR), isoprene rubber, styrene-butadiene rubber (SBR), nitrile-butadiene rubber, chloroprene rubber and the like. These may be used alone or in combination of two or more. Can be used. However, among these diene rubbers, chloroprene rubber has a relatively large specific gravity, and therefore it is not desirable to use it alone when the weight of the grip is limited.

Further, as the EPR, a usual copolymer containing 50 to 75% by weight of ethylene and 25 to 50% by weight of propylene is used, and as the EPDM, a diene such as ethylidene norbornene or dicyclopentadiene is added to these EPRs. The thing which added the 3rd system component is mentioned.

As the chlorobutyl rubber, a so-called liquid rubber having a relatively low molecular weight may be used, but a high molecular weight type is desirable from the viewpoint of easy handling.

The grip of the present invention, in the rubber component thus blended, an appropriate amount of a filler, a softening agent, a processing aid, an antioxidant, a vulcanizing agent, a vulcanization accelerator, a vulcanization accelerating aid, if necessary. , A flame retardant, a colorant, etc. are compounded, and the obtained rubber compound is molded into a desired shape by a conventional method, vulcanized, and further subjected to post-treatments such as coating and surface treatment, if desired. However, the vulcanization time can be shortened in the molding and vulcanization, and the productivity is high.

The rubber according to the present invention has an extremely high coefficient of dynamic friction, and has good wear resistance and weather resistance. Therefore, it can be used for sports such as golf clubs, tennis, badminton, squash, rackets such as racket balls, and ski poles. It is extremely suitable as a rubber material for grips of articles, grips for bicycles, motorcycles, and handles for various other mechanical devices.

Incidentally, the rubber according to the present invention is not limited to such a grip, soles of footwear, flooring materials, brake shoes, friction rolls for transportation, etc., and generally has a high dynamic friction coefficient and high wear resistance,
It can be applied to a wide range of other applications where high weather resistance is required.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples as long as the gist thereof is not exceeded.

Examples 1 to 4 and Comparative Examples 1 to 4 The kneaded dough of the rubber compound, which was weighed and kneaded in the formulations shown in Table 1, was molded and vulcanized into the shapes of the slab sheet and the golf club grip, respectively, and the grip was further Each of the characteristics was tested by painting and buffing to make a sample. The results are shown in Table 1.

Further, regarding Example 3 and Comparative Example 4, the optimum vulcanization time at 165 ° C. was examined, and the results are shown in Table 1.

As is clear from Table 1, the rubber according to the present invention has a high dynamic friction coefficient and excellent wear resistance and weather resistance. Therefore, it is apparent that the grip of the present invention made of such a rubber material has a non-slip, non-greasy and moist feel and is a very good grip.

Further, in particular, by comparing Examples 1 to 4 with Comparative Example 3 in which the content of chlorobutyl rubber is 30 parts by weight, which is larger than the range of the present invention, the content of chlorobutyl rubber is set to 25 parts by weight or less. It is clear that, due to the above, the wear resistance is enhanced.

Furthermore, by comparing Example 3 using chlorobutyl rubber and Comparative Example 4 using butyl rubber, it is clear that the vulcanization time is shortened by using chlorobutyl rubber.

 In Table 1, * 1 to * 7 indicate the following.

* 1: EPDM = EP33 manufactured by Nippon Synthetic Rubber Co., Ltd. * 2: Chlorobutyl rubber = Chlorobutyl 1066 manufactured by Exxon Chemical Co., Ltd. * 3: Dynamic friction coefficient = Measured with a dynamic friction coefficient meter manufactured by Kyowa Kagaku Co., Ltd. * 4: Wear resistance (Abrasion index) = Evaluated by measuring with a pico abrasion tester (abrasion index was calculated by setting the measurement result of Comparative Example 1 to 1) * 5: Weather resistance = Evaluated by the observation result of the state after one month of outdoor exposure * 6: Evaluation results by two professional golfers * 7: Not slippery and moist, but sticky and unsuitable as a grip [Effects of the Invention] As described in detail above, the grip of the present invention is obtained by molding and vulcanizing a rubber compound containing a specific amount of diene rubber, EPR and / or EPDM, and chlorobutyl rubber. It has a high coefficient of dynamic friction and is hard to slip.

 Excellent wear resistance and weather resistance.

 Therefore, the durability is good and the life is long.

It has excellent low-temperature characteristics and good temperature stability of various characteristics.

There is no stickiness and the moist feel when gripped is extremely good.

 Short vulcanization time and high productivity.

It has excellent properties such as, and is extremely useful as a grip for various sports goods and other mechanical devices.

Claims (2)

[Claims] 1. Diene rubber 45 to 90 parts by weight, ethylene-propylene binary copolymer and / or ethylene-propylene-diene terpolymer 5 to 30 parts by weight, and chlorobutyl rubber 5 to 25 parts by weight. A grip formed by molding and vulcanizing a rubber compound containing 2. The diene rubber is at least one selected from the group consisting of natural rubber, isoprene rubber, styrene-butadiene rubber, nitrile-butadiene rubber and chloroprene rubber.
Grip as described in the paragraph.